import pytest from helpers.cluster import ClickHouseCluster cluster = ClickHouseCluster(__file__) node1 = cluster.add_instance('instance') @pytest.fixture(scope="module") def start_cluster(): try: cluster.start() yield cluster finally: cluster.shutdown() def test_explain_estimates(start_cluster): node1.query("CREATE TABLE test (i Int64) ENGINE = MergeTree() ORDER BY i SETTINGS index_granularity = 16, write_final_mark = 0") node1.query("INSERT INTO test SELECT number FROM numbers(128)") node1.query("OPTIMIZE TABLE test") system_parts_result = node1.query("SELECT any(database), any(table), count() as parts, sum(rows) as rows, sum(marks) as marks FROM system.parts WHERE database = 'default' AND table = 'test' and active = 1 GROUP BY (database, table)") explain_estimates_result = node1.query("EXPLAIN ESTIMATE SELECT * FROM test") assert(system_parts_result == explain_estimates_result)